Tabletop Gaming News was nice enough to toss this small blurb on their page for me:
Errata: Sheriff Deputizing a friendly character
This was brought to my attention earlier. Originally the Sheriff was going to deputize someone by playing a small half-size card on them, but these cards were dropped from the game because they added too much expense. I'm adding the Deputize rules to the rulebook but here is the short and easy:
"When a Sheriff Deputizes a friendly character it gains +1 to its Guts value and is treated as a blue Lawmen card, regardless of the character (for purposes of special card and scenario objectives etc.)"